Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 1746

August 12, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2012, 6:28 PM CDT for 5 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Aug 12, 2012, 6:28 PM CDT (23:28 UTC)
Expired
Aug 12, 2012, 8:00 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 46 counties

Benton County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Van Buren County, AR, Washington County, AR, Cherokee County, KS, Crawford County, KS, Labette County, KS, Barry County, MO, Barton County, MO, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 42 km from the middle of the area, began a volume at 23:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 238 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2012-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2012-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 321 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2045 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
321 m²/s²
0-3 km storm-relative helicity
451 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 3:39 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Franklin, Johnson, Leavenworth and 3 more2 hr
Aug 12, 3:29 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more31 min
Aug 12, 3:55 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more7 hr
Aug 12, 6:06 PM CDTMesoscale DiscussionSPCBryan, Johnston, Marshall54 min

Nearby

Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Missouri, 2012Every mesoscale discussion in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.